Abstract: A spark plug boot assembly for interfacing an ignition signal conductor and a spark plug, the assembly including a spark plug boot having a hollow electrically conductive cylinder disposed on an interior boot surface, the cylinder having a flared lower cylinder end extending through the interior boot surface over a spark plug post-socketed terminal contact area, and having an upper cylinder end extending over the socketed terminal including over any crimp section of the socketed terminal. The cylinder further includes a seat for seating a collar about the socketed terminal when a full terminal insertion position is reached.

Abstract: A spark plug boot assembly providing for simplified assembly of a tubular boot and an ignition cable having a terminal with a circumferential rib or protuberance thereabout, wherein the tubular boot includes a plurality of aligned bottom stops spaced along the longitudinal boot axis from a plurality of aligned flexible arms reaching into a central boot bore, with a bi-directional locking position formed between the bottom stops and the flexible arms for locking, upon full insertion of the ignition cable through the bore, the rib or protuberance in the locking position.